And only because they sued Sierra. I think they are confused as to what abandonware is:

It was unfair that HeroQuest was included under the label of an "abandongame” , as this has never been true. There are huge communities of players all over the world that keep this game very active. It would be more appropriate to talk about an "adoptedgame".

I guess they think all of those copies of Hero's Quest on abandonware sites are soft copies of the "Herosquest" board game.